Boiler



F. B. HOWELL Oct. 9, 1928.

BOILER Filed Dec. 51. 1920 2 Sheets-Sheet 1 an we "mfoz Patented Oct. 9, 1928 N T D- STATES PATENT; o nc FRANK B. HOWELL, or BUFFALO, NEW YORK, ASVSKIGNORTO AMERICAN RADIATOR COMPANY, or CHICAGO, ILLINOIS, A CORPORATION on NEW JERSEY. 1

BOILER.

Application filed December 31, 1920. SerialNo. 434,262.

My invention relates to improvements in boilers, more particularly to boilers used in connection with heating systems, and the same has for its object to provide aboiler with an auxiliary. supply of preh ated :air so arranged that a proper volumeof air will be supplied continuously to the combustion chamber of the boiler during the operation thereof.

Another objectis to provide a boiler "hav ing a fuel charging opening with a closurefor said opening which is so constructed-that the auxiliary supply of air will pass therethrough into the, boiler.

.Another object. isto provide a boiler having a fuel receptacle in which the undue distillation of the fuel within the receptacle is prevented. l

Another object is to provide a boiler hav' ing a fuel receptacle with an auxiliary air supply so arranged as to prevent the heat of the flue gases from being transmitted to the fuel in-the receptacle.

' Another object is to provide a boiler having a plurality of fiues or heat-receiving portions which are separated from the fuel receptacle by air cells or chambers forming a partition extending the entire length of the fuel receptacle, and which serve to prevent,

in a-measure, the overheating of-said fuel with the boiler or boiler secti0ns,"and -posi-. tioned between the fuel receptacle and the flue or fiues.

Other objects will in part be obvious, and

in part be pointed out hereinafter;

To the attainment of the aforesaid'objects' and ends, my invention consists in the novel details of construction, and in the combine? tion, connection and arrangement of parts hereinafter more fully described and then pointed out in the claim.

In the accompanying drawings showing an illustrative embodiment ofthe invention and in which, for purposes of illustration, the in vention is shown in connection with a boiler of the sectional type Figure 1 is a front view showing one form of boiler constructed according to and embodying my said invention; a

Fig. 2 is a top view thereof;

33 of Figure 1;

Fig. 3 is a vertical section taken on the line Fig. 4 is. a horizontal sectionv taken on the l1ne44 of Fig. 3; and 1 Fig. 5 is an enlarged detail sectional'view showing the construction'of the magazine cover, and the airinlets thereof.

Referring to the drawings, the boiler comprises hollow end sections 10, and a plurality of hollow intermediate sections each of which is composed of a front member 12 and a rear member 13. Adjacent their. upper and low erportions said sections are provided with. registering openin 5 within which are se-' cured nipples'15, t ereby providing for the free circulation of water or fluid throughout theboiler, which is provided with a water-inlet or return 16 and a water. outlet 17. The assembled sections of the boiler are'preferably. enclosed by a casing 20.

- Each of the front members 12 comprises a vertical upper portion21 and a .rearzwardly I cent sections to form a plurality of air inlets 24 for the admission of primaryalr to support combustion of the incandescent fuel. Each of the rear members 13hasaforwardly extending portion 25 which overhangs the inclined lower portion 22 of its complement-, ary front portion 12. Each member 13 is. provided at the top and backthereof with transversely-extending peripheral ribs ,26, and at the front wall of its 'forwardly-extending portion with transversely-extending ribs 27,;the upper ends of which terminate at points below the horizontal peripheral ribs 26 at the top of the member, tojform openings 28 for a purposehereinafter described. Extending downwardly from the peripheral ribs 26 at the top of each member 13 are transversely-extending ribs 29 which are posi tioned to the 'rearof the ribs 27and are substantially parallel therewith. Each: member 13 is provided'intermediate its front and back-with inclined upwardly and forwardly extending ribs 30 terminating below the top of the boiler. 5

When the sections are assembled, the corresponding ribs of adjacent sections engage one another to form air chambers or conduits 31, and revertible flues 32 between the water compartments ofiadjacent sections, which. conduits and'flues extend from the combustion chamber 33 formed by the lower portions 22 of the front members 12 and the over-hanging forwardly extending portions 25 of the rear members 13. The air chambers or conduits 31 serve to admit an auxiliary supply of air to the combustion chamber 33; the air enter ing the upper ends of the conduits through the openings 28, and the flues 32 serving to conduct the products of combustion to the collecting flue 34 formed adjacent to the low er ends of the members 13 and thence to the smoke pipe 35.

The front walls of the forwardly extendingportions 25 of the rear member 13, together with the upper portions 21 of the front members 12, form a fuel receptacle 36 into which the fuel is delivered through a charging opening 37 preferably arranged in the upper portion of the casing 20. Positioned within the opening 37 is a frame 38 having an upwardly extending flange 39 provided with one or more cutaway portions 40. Pivotally mountedon the frame 38 is a cover 41 adapted to seat upon the flange 39, and having a downwardly extending flange 42 which, when the cover is closed, is spaced from the flange 39 to permit a constant supply of air to pass between' the flanges 39 and 42, and through the cutaway portion 40 into the upper end of the fuel receptacle 36 from which it passes through the openings 28 into the up per ends of the conduits 31. In order to prevent the fuel from passing into the upper ends of the conduits 31, suitable baffles 43 are provided which are positioned in front of the openings 28.

In order to provide for the cleaning of the flues 32, the peripheral ribs may be cut away to form openings 44 normally closed by covers 45, which openings register with a large: opening 46 in the casing provided with a single cover 47. v

In operation, the fuel column is supported upon the lower portion 22 of the front members 12, and by the bed of ashes in the ash pit, the feed of fuel being maintained constant by the reserve fuel contained within the receptacle 36. The main supply of air necessary to support combustion passes through the spaces 24 between the ribs 24, and into the burning fuel, and the products of combustion pass from the combustion chamber, through the flues 32 and openings 34 into the smoke pipe 35. As the products of combustion pass from the combustion chamber into the flues,

auxiliary air will be drawn downward through the conduits 31, the proper amount of air, being admitted to the upperends of the conduits through the air passage formed ber 7 e such as to insure proper combustionv of thememes between the frame 38 and the door 41. As the air passes downward through the conduits, it will be gradually and increasingly heated by the hot gases passing through the flues until it enters into the combustion chamat which time its temperature will be from the incandescent fuel undue cooling of the comgases liberated and prevent the bustible gases. positioned between the rear members 13 of the intermediate sections, the supply of auxiliary air which is delivered into the combustion chamber will be uniformly distributed throughout the width thereof and thus insure a uniform mixing with and combustion of the gases liberated from the fuel.

As the air conduits 31 are Asthe air upon enteringthe conduits 31 i is at a lower temperature as compared to the temperature of the flue gases, and does not attain its maximum temperature until it reaches the combustion chamber, it wiil'serve heat insulating medium to prevent the heat from being transmitted to the fuel with in thefuel receptacle 36, and thereby. prevent any undue distillation of the fuel therein.

Having thus describedmy said invention, what I claim and desire to secure by'Letters Patent is A boiler comprising end sections and a plurality of intermediate sections, each of said intermediate sections comprising a front member and a back member arranged in spaced relation relative to each other; said back members-each having an intermediate forwardly-projecting angular portion and forming jointly with said front members a vertical tapering fuel magazine extending transversely of the boiler, said front mem bers each having an inwardly anddownward 1y inclined grate portion extending below the projecting angular portion of its respective of secondary air between said fuel magazine and the flues disposed to the rear of and extending from said combustion chamber to the smokeoutlet of the boiler, substantially as specified.

longitudinally from said fuel receptacle to- Signed at the city of Buffalo, Erie County, in the State of New York, this 23d day of November, one thousand nine hundred and twenty.

' V FRANK B. HOWELL. 

